Google announced that Google Now, the predictive search feature from Google, is now available on iOS devices. You can download it by just downloading or upgrading the Google Search App via iTunes App Store.
Once you do, to activate it, you need to load the app and agree to the prompts. Note, when you do that, you will notice that the GPS indicator is always on. The app constantly polls your location, so that Google can serve you predictive search results. I should note, this may have a battery performance implication to your device.
If you want to turn that off, you can, but it will prevent Google Now from doing its thing. Here is how to stop it:
Google Now Available For iPhone/iPad
Taken From : http://www.seroundtable.com/google-now-iphone-ipad-16717.html